Patent Number: 6,293,360

Title: Thread joint percussive drilling equipment

Abstract: A thread joint for percussive drilling equipment includes first and second percussive drill string components, the first component including a spigot. An external thread is formed on the spigot, and an internal thread is formed on the second component. Each of the internal and external threads includes an end section gradually transforming into a full thread section. The end section includes a pair of flanks, and the full thread section also includes a pair of flanks. Both flanks of the end section have a different profile than the corresponding flanks of the full thread section.

Inventors: Liljebrand; Per-Olof (Sandviken, SE), Olsson; Urban (Forsbacka, SE)

Assignee: Sandvik AB

International Classification: E21B 17/042 (20060101); E21B 17/02 (20060101); E21B 017/00 ()

Expiration Date: 09/25/2018